Komatsu Fault Code
Free · no signup989L00
No start; Controller Lock Caution.
System
Security
Symptom
No start; Controller Lock Caution.
Diagnosis & fix steps
Controller Lock Caution.
LOGIC: Security lockout (Mode 1).
ACTION: Sync monitor and ECM.
FIX: Enter Service Menu and re-sync password.
Red Seal field insights
Hold 'Down Arrow' + Top 3 buttons to enter the hidden service menu and re-verify the ID.
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